A sample of size 25 is drawn from a population where 39% of the population is over the age of 40. In the sample, 41% are over the age of 40. Which is the z score for this result?
A : 2.1
B : -2.1
C : 0.20
D : -0.20
A sample of size 25 is drawn from a population where 39% of the population is...
A sample of size 31 will be drawn from a population with mean 39 and standard deviation 9 (a) Is it appropriate to use the normal distribution to find probabilities for x? (b) If appropriate find the probability that x will be between 40 and 41 Round the answer to at least four decimal places. (c) If appropriate find the 33rd percentile of x . Round the answer to at least two decimal places
A random sample of n=36 observations is drawn from a population with a mean equal to 24 and a standard deviation equal to 12. a. Give the mean and standard deviation of the (repeated) sampling distribution x over bar x. b Describe the shape of the sampling distribution of x over bar x. Does your answer depend on the sample size? c. Calculate the standard normal z-score corresponding to a value of x over bar x=19. d. Calculate the standard...
A random sample of n=36 observations is drawn from a population with a mean equal to 24 and a standard deviation equal to 12. a. Give the mean and standard deviation of the (repeated) sampling distribution x over bar x. b Describe the shape of the sampling distribution of x over bar x. Does your answer depend on the sample size? c. Calculate the standard normal z-score corresponding to a value of x over bar x=19. d. Calculate the standard...
A random sample of n=36 observations is drawn from a population with a mean equal to25 and a standard deviation equal to 24 a. Give the mean and standard deviation of the (repeated) sampling distribution x over bar x. b. Describe the shape of the sampling distribution of x over bar x. Does your answer depend on the sample size? c. Calculate the standard normal z-score corresponding to a value of x over bar x = 20. d. Calculate the...
A sample of size 25 will be drawn from a population with mean 129 and standard deviation 25 (a) Is it appropriate to use the normal distribution to find probabilities for x? (b) If appropriate find the probability that x will be less than 116. (c) If appropriate find the 90 percentile of x. (a) Is it appropriate to use the normal distribution to find probabilities for x? Yes No (b) The probability that will be less than 116 is...
#25 A simple random sample of size n equals 40 is drawn from a population. The sample mean is found to be x overbar equals 121.3 and the sample standard deviation is found to be s equals 12.2. Construct a 99% confidence interval for the population mean. The lower bound is nothing. (Round to two decimal places as needed.) The upper bound is nothing. (Round to two decimal places as needed.)
A simple random sample of size n=40 is drawn from a population. The sample mean is found to be 106.9,and the sample standard deviation is found to be 15.1. Is the population mean greater than 100 at the α=0.025 level of significance? A) Determine the null and alternative hypotheses. B) Compute the test statistic C) Determine the P-value. (Round to three decimal places as needed.) D) What is the result of the hypothesis test? ____ the null hypothesis because the...
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x overbar, is found to be 108, and the sample standard deviation, s, is found to be 10. (a) Construct a 95% confidence interval about mu if the sample size, n, is 25. (b) Construct a 95% confidence interval about mu if the sample size, n, is 12. (c) Construct a 70% confidence interval about mu if the sample size, n,...
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x overbarx, is found to be 107,and the sample standard deviation, s, is found to be 10. (a) Construct a 95% confidence interval about μ if the sample size, n, is 25. (b) Construct a 95% confidence interval about μ if the sample size, n, is 13. (c) Construct an 80% confidence interval about μ if the sample size, n, is...
A
sample of size 45 will be drawn from a population with mean 10 and
standard deviation 5. Find the probability that x will be greater
than 11.
32) A sample of size 45 will be drawn from a population with mean 10 and standard deviation 5. Find the probability that x will be greater than 11. B) 0.9099 A) 0.0901 C) 0.0721 D) 0.1170